package com.zhang.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * 属性文件助手类
 */
public class PropsUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     */
    public static Properties loadProps(String fileName){
        Properties props = null;
        InputStream is = null;

        try{
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if(is == null){
                throw new FileNotFoundException(fileName + " is not found!");
            }
            props = new Properties();
            props.load(is);
        } catch (IOException e) {
            e.printStackTrace();
            LOGGER.error("load properties failed", e);
        } finally {
            if(is != null){
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    LOGGER.error("close input stream fail!", e);
                }
            }
        }
        return props;
    }

    /**
     * 获取字符串属性（可指定默认值）
     */
    public static String getString(Properties props, String key, String defaultValue){
        String value = defaultValue;
        if(props.containsKey(key)){
            value = props.getProperty(key);
        }
        return value;
    }

    /**
     * 获取字符串属性
     */
    public static String getString(Properties props, String key){
        return getString(props, key);
    }

    /**
     * 获取数值属性
     */
    public static int getInt(Properties props, String key){

        return 0;
    }


}
